Identifying the K member and rear
the 8 3/4 rear does not have a diff cover its just looks like a ball on the back
you can check your gearing by marking the driveshaft and doing a full rotation on the wheel and count it (just a ballpark gues)
both wheels spin the same direction you have a sure grip
sorry i dont have any pics of a k member look at the fender tag and decode it and see with what engine it had